Roll Dart SDK from fd4797c1464b to a1c1e0d3bb18 (1 revision) (#41427)

https://dart.googlesource.com/sdk.git/+log/fd4797c1464b..a1c1e0d3bb18

2023-04-23 dart-internal-merge@dart-ci-internal.iam.gserviceaccount.com Version 3.1.0-35.0.dev

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/dart-sdk-flutter-engine
Please CC aam@google.com,chinmaygarde@google.com,dart-vm-team@google.com,rmistry@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Flutter Engine: https://github.com/flutter/flutter/issues/new/choose

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

Author: skia-flutter-autoroll

DEPS

@@ -47,7 +47,7 @@ vars = {
   # Dart is: https://github.com/dart-lang/sdk/blob/main/DEPS
   # You can use //tools/dart/create_updated_flutter_deps.py to produce
   # updated revision list of existing dependencies.
-  'dart_revision': 'fd4797c1464b301bde69085e85742193e6ec37e6',
+  'dart_revision': 'a1c1e0d3bb187e04068459d5baf56410f5b93a26',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py